Ejector cycle system

摘要

An ejector cycle system with a refrigerant cycle through which refrigerant flows includes an ejector disposed downstream of a radiator, a first evaporator that evaporates refrigerant flowing out of the ejector, a throttling unit located in a branch passage and depressurizes refrigerant to adjust a flow rate of refrigerant, and a second evaporator located downstream of the throttling unit. In the ejector cycle system, a flow ratio adjusting means adjusts a flow ratio between a first refrigerant flow amount depressurized and expanded in a nozzle portion of the ejector and a second refrigerant flow amount drawn into a refrigerant suction port of the ejector, based on a physical quantity related to at least one of a state of refrigerant in the refrigerant cycle, a temperature of a space to be cooled by the first and second evaporators, and an ambient temperature of the space.

主权项

1. An ejector cycle system with a refrigerant cycle through which refrigerant flows, the ejector cycle system comprising:
a compressor configured to draw and compress refrigerant; a radiator located to radiate heat from high-pressure refrigerant discharged from the compressor; an ejector disposed downstream of the radiator, the ejector having a nozzle portion for depressurizing and expanding refrigerant, a refrigerant suction port through which refrigerant is drawn by a high-speed refrigerant flow jetted from the nozzle portion, and a pressure increasing portion for mixing refrigerant drawn through the refrigerant suction port with the high-speed refrigerant flow and for decelerating the mixed refrigerant flow to raise a pressure of the refrigerant flow; a first evaporator located to evaporate the refrigerant flowing out of the ejector; a branch passage that is branched from a branch portion between the radiator and the nozzle portion of the ejector and is coupled to the refrigerant suction port of the ejector, to guide the refrigerant flowing out of the radiator into the refrigerant suction port; a throttling unit located in the branch passage, the throttling unit having a fixed throttle that depressurizes refrigerant flowing through the throttling unit to adjust a flow amount of the refrigerant, the fixed throttle having a throttling opening which is set to a predetermined opening; a second evaporator that is located in the branch passage downstream of the throttling unit to evaporate the refrigerant flowing from the throttle unit; and a variable throttling device located in a refrigerant passage between the branch portion of the branch passage and a refrigerant inlet port of the nozzle portion to decompress the refrigerant; wherein the variable throttling device is configured to adjust an opening degree of a valve body portion, based on at least one of a superheat degree of refrigerant at a refrigerant outlet side of the first evaporator, a temperature and a pressure of refrigerant at the refrigerant outlet side of the radiator, a flow amount of refrigerant discharged from the compressor, a temperature of a space to be cooled by the first evaporator and the second evaporator, and an ambient temperature of the space to be cooled; and refrigerant always flows through the throttling unit when the compressor operates.